Mask



FIG. 1 is a perspective view of a mask, showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof with the right side elevational view being a mirror image of the left side elevational view;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a mask, as shown and described. 